In comparison to Gram –ve bacteria, Gram +ve bacteria :
(a) have less peptidoglycan
(b) have more complex cell walls
(c) retain the crystal violet dye
(d) are more resistant to antibiotics

Options

A. have less peptidoglycan
B. have more complex cell walls
C. retain the crystal violet dye
D. are more resistant to antibiotics

Explanation

To answer the question regarding the comparison between Gram-positive and Gram-negative bacteria, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Gram Staining**:
- Gram staining is a method used to classify bacteria into two groups based on the structure of their cell walls.

2. **Peptidoglycan Layer**:
- Gram-positive bacteria have a **thick peptidoglycan layer**. In contrast, Gram-negative bacteria have a **thin peptidoglycan layer**.
- Therefore, the statement that Gram-positive bacteria have less peptidoglycan is **incorrect**.

3. **Complexity of Cell Walls**:
- Gram-positive bacteria generally have a simpler cell wall structure compared to Gram-negative bacteria, which have a more complex cell wall due to the presence of an outer membrane and lipopolysaccharides (LPS).
- Thus, the statement that Gram-positive bacteria have more complex cell walls is **incorrect**.

4. **Retention of Crystal Violet Dye**:
- Gram-positive bacteria retain the crystal violet dye during the Gram staining process due to their thick peptidoglycan layer. This is why they appear purple or blue after staining.
- Therefore, the statement that Gram-positive bacteria retain the crystal violet dye is **correct**.

5. **Resistance to Antibiotics**:
- Gram-negative bacteria are generally more resistant to antibiotics than Gram-positive bacteria. This is due to their outer membrane, which acts as a barrier to many substances, including certain antibiotics.
- Thus, the statement that Gram-positive bacteria are more resistant to antibiotics is **incorrect**.

### Conclusion:
The correct answer to the question is **(c) retain the crystal violet dye**.